package com.thread.collection.Map;

import java.util.*;

public class SynchronizedMapTest {

        static Map<UUID,UUID> m = Collections.synchronizedMap(new HashMap<UUID,UUID>());

        static int count = Constants.COUNT;
        static UUID[] keys = new UUID[count];
        static UUID[] values = new UUID[count];

        static final int THREAD_COUNT = Constants.THREAD_COUNT;
        static{
        for(int i=0;i<count;i++){
            keys[i] = UUID.randomUUID();
            values[i] = UUID.randomUUID();
        }
    }
        static class MyThread extends Thread{
            int start;
            int grap = count / THREAD_COUNT;
            public MyThread(int start){
                this.start = start;
            }

            @Override
            public void run() {
                for(int i=start;i<start+grap;++i){
                    m.put(keys[i],values[i]);
                }
            }
        }

        public static void main(String[] args) {
        long start = System.currentTimeMillis();
        Thread[] ts = new Thread[THREAD_COUNT];

        for(int i=0;i<THREAD_COUNT;i++){
            ts[i] = new HashTableTest.MyThread(i*(count / THREAD_COUNT));
        }

        for(int i=0;i<ts.length;++i){
            ts[i].start();;
        }

        for(int i=0;i<ts.length;++i){
            try {
                ts[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        System.out.println(System.currentTimeMillis() - start);

        System.out.println("---------------------------");

        start = System.currentTimeMillis();
        for(int i=0;i<THREAD_COUNT;i++){
            ts[i] = new Thread(()->{
                int capcity = (count / THREAD_COUNT);
                for(int j=0;j<capcity;++j){
                    m.get(keys[10]);
                }
            });
        }

        for(int i=0;i<ts.length;++i){
            ts[i].start();;
        }

        for(int i=0;i<ts.length;++i){
            try {
                ts[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        System.out.println(System.currentTimeMillis() - start);
    }

}
